My question is if she will working good with my Powerex Z-speed 550 IMCS 39 or will be necessary to get Severne mast.
Also let me know if anybody else have a special detail to tune up the sail with this mast .
Regards.

I never try this mast on the sail, but if I am not wrong, this mast have a biger diameter and is really heavy. The diameter must be not a problem, but the stifness is too much. This sail is for the Red Line 550 imcs 34 with a tip exension of 30 cm.

My 11,6 is working best with Severne RL 550 +27cm Tip Ext. and for more light wind power using the YES 560 37 100%C with 31cm Tip Ext. I trim down to 591cm, not to loose than it will be to flat. Upwind +2cm outhole and downwind up to -12cm.
BR peter